The connotation of PIN numbers
I discovered some time ago a neat "trick" for mobile phones that not many people know, and that I'm sure the "security paranoid" bunch of people will appreciate.
When your mobile phone prompts for a pin, strangely, it lets you insert more than 4 numbers. That's because: pins can be longer than 4 digits on mobile phones!
I investigsted a little further and it turns out that wikipedia has it documented! It's curious how we have asociated the term "PIN code" with only 4 digits. Maybe phone manufacturers should of called it Unlock Number to take the 4 number connotation out...
So now you know it... you can have the worst type of PIN... One that is probably out of the mental scope of an attacker. And if you're a developer and need to ask for a numeric password be careful of the connotation of "PIN". Maybe you'll find yourself with all passwords beeing 4 digits long, altough you support more ;)